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Designer Cytokine Hyper Interleukin 11 (H11) is a Megakaryopoietic Factor

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Journal Int J Med Sci
Specialty General Medicine
Date 2013 Jul 23
PMID 23869192
Citations 5
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Abstract

Interleukin-11 (IL-11) displays megakaryopoietic activity. We constructed super-cytokine Hyper- IL11 (H11) by linking soluble IL-11 receptor α (sIL-11Rα) with IL-11, which directly targets β-receptor (gp130) signal transducing subunit. The effects of H11 on hematopoiesis with a focus on megakaryopoiesis were studied. The expansion, differentiation and type of colony formation of cord blood progenitor Lin-CD34+ cells were analyzed. H11 was more effective than recombinant human IL-11 (rhIL-11) in enhancement of the Lin-CD34+ cells expansion and differentiation into megakaryocytes (Mk). It induced higher expression of CD41a and CD61 antigens, resulting in a substantially larger population of CD34-CD41a(high)CD61(high) cells. H11 treatment led to increased number of small and mainly medium megakaryocyte colony formation (Mk-CFU). Moreover, it induced the formation of a small number of large colonies, which were not observed following rhIL-11 treatment. Significantly higher number of H11 derived Mk colonies released platelets-like particles (PLP). Furthermore, H11 was considerably more potent than rhIL-11 in promoting differentiation of Lin-CD43+ cells toward erythrocytes. Our results indicate that H11 is more effective than rhIL-11 in enhancing expansion of early progenitors and directing them to megakaryocyte and erythroid cells and in inducing maturation of Mk. Thus, H11 may prove beneficial for thrombocytopenia treatment and/or an ex vivo expansion of megakaryocytes.

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